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AssigneeDaikin Industries, Ltd.
InventorsMana SHIMOKAWA, Tatsuya TAKAKUWA, Kazuhiro TAKAHASHI
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The present invention provides a method for separating HFC-245cb and (E)-HFO-1234ze having close boiling points, i.e., boiling points with only 1° C. difference, by extractive distillation from a composition containing the HFC-245cb and the (E)-HFO-1234ze. More specifically, the present invention is a method for separating HFC-245cb and (E)-HFO-1234ze from a composition containing the HFC-245cb and the (E)-HFO-1234ze, the method comprising subjecting the composition to extractive distillation using at least one extractant selected from the group consisting of halogenated hydrocarbons, halogenated unsaturated hydrocarbons, nitriles, ketones, carbonates, alcohols, hydrocarbons, esters and ethers.
A method for separating HFC-245cb and (E)-HFO-1234ze from a composition comprising the HFC-245cb and the (E)-HFO-1234ze, the method comprising subjecting the composition to extractive distillation in the presence of at least one extraction solvent selected from the group consisting of halogenated hydrocarbons, halogenated unsaturated hydrocarbons, nitriles, ketones, carbonates, alcohols, hydrocarbons, esters, and ethers.
Dependencies are inferred from the claim text.